I think you won't notice any gain, because Insight wheels are pretty smooth already. You may try to measure that but you'll add some weight to the wheels so it will affect your FE too but in other direction.
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Quote:
Gerhard Plattner: "The best attitude is to consider fuel saving a kind of sport. Everybody who has enough money for a strong car, can drive fast and hit the pedal. But saving fuel requires concentration, self-control and cleverness. It's a challenge with the nice effect of saving you money that you can use for other more important things."
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